Vision:
0% chance to be seen at outset of game.
0% chance to be seen at outset of game if independent.
Not always seen even if terrain has been seen.
Vision effect when occupying: 100 by default, 0 in Sea Transports, Cargo Planes.
Occupants not seen even if unit has been seen.
Chance to see if in same cell is 100% by default, 0% for Submarine, Sea Mines, 30% for Spy Planes.
Chance to see if adjacent is 50% for Ruins, Fortifications, Mech Infantry, Marines, Artillery, AA Battery, Field HQ, Germinator, Sea Transports, 100% for Town, City, Grand Citadel, Metropolis, Capitol, Base, Sea Base, Cargo Planes, 70% for Cavalry, Armor, Engineers, Fighters, Escort Fighters, Dive Bombers, Torp Bombers, Bombers, 0% for Shipwreck, Submarine, Spy Planes, Minefield, Sea Mines, 15% for Cruiser, Command Cruiser, Escort Carrier, 30% for Infantry, Paratroopers, 20% for Battleship, Light Carrier, 10% for Destroyer, Frigate, 5% for Torpedo Boats, Patrol Ship, 25% for Fleet Carrier.